FILE - In this Nov. 6, 2011 file photo, Chad Devereaux examines bricks that fell from three sides of his in-laws home in Sparks, Okla., after two earthquakes hit the area in less than 24 hours. New federal research says small earthquakes shaking Oklahoma and southern Kansas daily are dramatically increasing the chance of bigger and dangerous quakes, new federal research indicates. (AP Photo/Sue Ogrocki, File)